|Originally posted by zkhennings:|
But what else could it possibly be? It is not a super strong smell like with the old engine where my eyes would water, but it is there for sure. Could it be the PCV? I was under the impression the only thing the PCV does is stop pressure from going INTO the crankcase.
Part of the job of the PCV system is that it lets faint amounts of oil traverse into the intake itself. If you notice, the "front" side of the engine has a PCV tube that goes directly to the air intake. Over normal operation, residual traces of oil will travel up into the intake. However the idea is that with it going into the intake it would eventually burn off due to mixing in with the combustion mixture (fuel & air). This is normal operation.
With it being an issue where you are only smelling the oil upon deceleration, it could possibly be a PCV issue, where maybe you are smelling more than just residual oil that is not being burned off. When engine braking, you are not applying throttle, so the throttle body butterfly should be near closed and none (or VERY little) of the residual oil would be going through the intake to mix with combustion.
You could simply remove the air intake tube and look at the bottom inside of it to see if there is traces of oil. Clean it up, re-install it, and run it again for a short bit and see if you're seeing more oil. You shouldn't see it within a short period of operation. The idea is that cars with this type setup overtime get residual oil in the intake tube from the PCV simply because not all oil is burned off because it's not pulled through to be combusted.